L2234
L2778
Emax
24/158
Doc. No.
Model
Apparatus
Scale
Page No.
1SDH000460R0002
10. Accessories
10.1 Electrical accessories
Shunt opening/closing (YO/YC) and second shunt opening release (Y02)
This allows remote opening or closing control of the apparatus. Given the characteristics of the circuit-breaker operating mechanism, opening
(with the circuit-breaker closed) is always possible, whereas closing is only possible when the closing springs are loaded. Most of the releases
can operate with either direct or alternating current. This release carries out an instantaneous service (*), but can be supplied permanently (**).
In uses where the shunt closing release is supplied permanently, to carry out the circuit-breaker reclosing operation after opening, it is necessary
to momentarily de-energize the shunt closing release (the circuit-breaker operating mechanism reclosing is, in fact, fitted with an antipumping
device).
In some versions it is necessary to have a very high degree of safety for the remote opening control of the circuit-breaker, and, in particular, the
duplication of the control circuit of the shunt opening release is required. In order to achieve this, you can fit the SACE Emax circuit-breakers with
a second shunt opening release. The second shunt opening release is located in the same seat as the undervoltage release and its technical
characteristics are the same as the standard shunt opening release.
(*) In the case of instantaneous service, the minimum duration of the current impulse must be 100 ms.
(**) In the case of permanent power supply to the shunt opening release, you must wait for at least 30 ms before giving the opening control to the shunt closing release.
Reference figures in the electrical circuit diagrams: YO (4) - YC (2) - YO2 (8)
Undervoltage release (YU)
The undervoltage release opens the circuit-breaker in the case of a considerable drop or lack of its power supply voltage. It can be used for remote
tripping (by means of normally closed type pushbuttons), as a lock on closing or to control the voltage in the primary and secondary circuits.
The release power supply is therefore branched on the supply side of the circuit-breaker or from an independent source. Circuit-breaker closing
is only allowed with the release powered (the closing lock is carried out mechanically). Most of the releases can operate with either direct or alternating
current.
Power supply (Un)
24 V DC
30 V AC/DC
48 V AC/DC
60 V AC/DC
110-120 V AC/DC
120-127 V AC/DC
220-240 V AC/DC
240-250 V AC/DC
380-400 V AC
440 V AC
Operating limits:
(YO-YO2): 70% ... 110% Un
(CEI EN 60947-2 Standards).
(YC): 85% ... 110% Un
Circuit-breaker opening takes place with power supply voltage values of the release equivalent to 35 - 70% Un.
Circuit-breaker closing is possible with power supply voltage of the release equivalent to 85-110% Un.
It can be fitted with a signalling contact for undervoltage release energized (C. aux YU).
Inrush power consumption (Ps):
DC = 200 W
AC = 200 VA
Continuous power (Pc):
DC = 5 W
AC = 5 VA
Opening time (YU):
30 ms
Insulation voltage
2500 V 50 Hz (for 1 min.)
Reference figures in the electrical circuit diagrams: YU (6)
Power supply (Un)
24 V DC
30 V AC/DC
48 V AC/DC
60 V AC/DC
110-120 V AC/DC
120-127 V AC/DC
220-240 V AC/DC
240-250 V AC/DC
380-400 V AC
440 V AC
Operating limits
(YO-YO2) : 70…110% Un
(CEI EN 60947-2 Standards)
(YC) : 85…110% Un
Inrush power consumption (Ps)
DC = 200 W
Inrush power time ~100 ms
AC = 200 VA
Continuous power (Pc)
DC = 5 W
AC = 5 VA
Opening time (YO - YO2)
(max) 60 ms
Closing time (YC)
(max) 80 ms
Insulation voltage
2500V 50 Hz (for 1 min.)
